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Short for the Japanese "chuunibyou", which roughly means "second year of middle school sickness". It's an adjective for describing teenagers who try to act cool by being super mature or different, or dark and edgy, but fail miserably because they're still thirteen. They will often pretend to be criminal or have a "bad boy/girl" image, attach themselves to an obscure musical or artistic subculture, or create super cool imaginary alter-egos of themselves, making sure to post plenty of terrible fan-art and fan-fiction about it online.
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